Chevron recently announced that it successfully completed a record setting production test on the Jack #2 well in the Gulf of Mexico.
At a total depth of 28,175 feet, the Jack #2 is the deepest successful well test drilled with a sustained flow rate of more than 6,000 barrels of crude oil per day.
More than half a dozen world records were set for test equipment pressure, depth and duration in deep water were set during the Jack well test, helping CHevron and co-owners carry out the deepest extended drill stem test in deep-water Gulf of Mexico history.
Chevron's success is undoubtedly historic, but the Jack #2 is not "the first" deep well ever drilled in deep water. Similar efforts are being conducted in the Gulf, and plannned elsewhere by other oil companies.
Additionally Chevron's announcement is not "new" news. The well was drilled in 2004 and the company spent the last 2 years evaluating and testing the prospect. While the Jack well penetrated a respectable amount of "oil pay", the technical teams of Chevron required large amounts of additional testing, data gathering and analysis in order to solidify future development plans. Thus, the company kept the news close to their chest till last week.
Considering that Chevron needed to spend huge sums of money to the tune of almost $80 million per year just to rent a rig and the extra costs of geoplogists, petroleum engineers, drill bits, mud, wireline services and the rest, to explore the commercial viability of the discovery and to coduct follow up testing after the drilling of the Jack #2, it is not surprising that the company kept its information tight.
Though Chevron and its partners have not publicized data on the oil quality and reservoir parameters of the Jack #2, an insider from Devon Energy Corp, a partner, stated that while the oil-bearing rocks at Jack #2 do not present any "undue complexity", the producing reservoirs are very different from one another. This might have to do with fraction systems within rock formations and the intrusion of lower and older salt beds into the rock formations above, with salt formations playing a prominent role in controlling the location and entrapment of petroleum.
Some estimates place the oil resources in the deep waters of the Gulf of Mexico in the range of 15 billion barrels. These are expected to be in the lowr Tertiary formations below the "allochthonous salts", which are the bed of salts that overlay the stratigraphically "younger" formations. These subsalt formations are the targets aimed at by oil-exploring firms.
There might be a lot of oil there if you can find it. But it's cheaper to send space probes to Mars than to drill beneath the deep salt!
Though Chevron and its partners have not described the quality of gas or oil, sulfur content, or the oil-to-gas ratio of the reservoir, it is believed that the reservoirs are oil dominant.
Since the Jack well is located far from all existing subsea oil-gathering pipelines, the transport of oil to shore poses a major logistic problem.
Chevron and Devon have been in discussions with the US Minerals Management Service regarding the possibility of using floating production, storage and offloading vessels.
An additional concern is that if the facility, when productive, produces associated natural gas, then that will also present a handling problem. Thus the production associated gas could be used to power the production platform or it will have to be re-injected into the rock formation.
Cost estimates for field development in the vicinity of Jack #2 are about $80-120 million per well drilled, with an additional $1.3 to $1.5 billion for subsea facilities.
Chevron's Tahiti project, located elsewhere in the in the deep waters of the Gulf of Mexico carries a $3.5 billion price tag and is expected to produce 125,000 barrels per day. Chevron's Blind Faith project in the Gulf of Mexico will cost an estimated $1 bilion and yield about 30,000 barrels per day.
The capital expenditure per barrel of oil equivalent produced per day is $28,000 and $33,000 respectively for the two projects, in contrast to shallow water, shelf development in the Gulf of Mexico which is tagged at about $1,000 per barrel of oil equivalent produced per day.
So deep water development may be 30 times more expensive than shallow water offshore development.
There will be other deep-water wells, but the Jack #2 stands alone as the milestone on the pioneering trail, being the first confirmation of a significant oil discovery in a frontier exploration area.
The Jack well stands as an example of applying immense measures of resources to solving a great problem. It stand as a symbol of the culture and industry of our interrelated world with decades' worth of fundamental research, development work by industry and government, spectacular scientific and engineering developments and entreprenurs coming together to pull it off.
Chevron utilized the most advanced scientific and engineering assets, locating and drilling a well in deep water, based entirely on information gained from remote sensing. Among the indispensable developments behind the Jack #2 well were those in geology, oceanography, geophysics, cartography, numerical computing, signal processing, drill bit design, drilling rig design, down-hole logging and completion, metallurgy, mathematics and more.
The Chevron effort is emblematic of our era but should not be confused with the "technology will save us" line of thinking.
Chevron has gone offshore, into deep water and conquered the rock. Like the Titusville well of 1859, the greatest accomplishment of the Jack #2 is that it shows that it can be done.
Mankind is entering upon the backside of Hubbert's curve. Global oil production is on the verge of entering the phase of irreversible decline. Worldwide oil extraction and depletion has exceeded oil discover by a wide margin for many years now.
Chevron's announcement is well timed and welcome in the present climate but it further illustrates a key element in the Peak Oil thesis... "easy" oil is gone. We have been drilling it up, lifting it out of the ground and voraciously consuming it for 147 years. The oil that we'll lift in the future will be in faraway places, under difficult conditions and in harsh climates besides being expensive.
So be warned. If you ever left the world of Peak Oil... welcome back.
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